Question

What is the solution to the following system of linear equations?

x − 2y = −1
2x + y = −12
 
A (-3,-1)                      C (-2,-5)
B (-4,-4)                       D (-5,-2)

Answer 1

x − 2y = −1 => x = 2y -1

2x + y = −12
2(2y - 1) + y = -12
4y - 2 + y = -12
5y = -10
y = -2
x = 2·(-2) - 1
x = -4 - 1
x = -5

Answer D (-5,-2)